GRN 28x35x4 NBR AO/TC Double Lip Rotary Shaft Oil Seal

GRN 28x35x4 NBR AO/TC Double Lip Rotary Shaft Oil Seal

GRN 28x35x4 NBR AO/TC is a double lip rotary shaft oil seal with an inside diameter of 28 mm, outside diameter of 35 mm and width of 4 mm. The sealing material is NBR - Nitrile Butadiene Rubber. The AO/TC configuration combines a spring-loaded primary sealing lip with an additional dust lip, providing a compact sealing solution for rotating shafts where both lubricant retention and protection of the primary sealing area are required.

GRN 28x35x4 NBR AO/TC - Technical Specification

Brand: GRN

Product type: Rotary shaft oil seal

Design: AO/TC - Double Lip

Material: NBR - Nitrile Butadiene Rubber

Dimensions: 28x35x4 mm

Inside diameter d: 28 mm

Outside diameter D: 35 mm

Width B: 4 mm

Primary sealing lip: Spring-loaded

Garter spring: Yes

Additional dust lip: Yes

GRN 28x35x4 Oil Seal Dimensions

Inside diameter d: 28 mm

Outside diameter D: 35 mm

Width B: 4 mm

Complete dimensions: 28x35x4 mm

The first dimension, 28 mm, is the nominal inside diameter corresponding to the shaft diameter. The second dimension, 35 mm, is the outside diameter of the seal. The third dimension, 4 mm, is the axial width.

The complete 28x35x4 mm specification should be retained when identifying or searching for a replacement.

A 28x35x5 or 28x35x7 oil seal is not dimensionally identical to this 4 mm wide version.

AO/TC Double Lip Oil Seal Design

Design: AO/TC

Configuration: Double Lip

Primary sealing lip: Spring-loaded

Secondary lip: Dust lip

The primary radial sealing lip forms the main sealing interface with the rotating shaft and is supported by a garter spring.

The additional secondary lip is positioned toward the external side and acts as a barrier against dust and external contamination.

This double lip configuration distinguishes the AO/TC version from a corresponding single lip rotary shaft seal.

Additional Dust Lip

Additional dust lip: Yes

The secondary dust lip provides an additional barrier between the external environment and the primary sealing area.

It helps limit the ingress of dust and other external contaminants toward the main sealing lip and shaft contact zone.

The presence of this additional lip should therefore be considered when comparing GRN 28x35x4 AO/TC with other 28x35x4 mm oil seals.

Spring-Loaded Primary Sealing Lip

Primary sealing lip: Spring-loaded

Garter spring: Yes

The primary radial sealing lip is supported by a garter spring, which helps maintain contact between the sealing edge and the rotating shaft.

The spring and lip configuration forms an important part of the seal construction and should be considered when selecting a technically suitable replacement.

NBR - Nitrile Butadiene Rubber

Sealing material: NBR

Full material name: Nitrile Butadiene Rubber

NBR is widely used in rotary shaft sealing technology and is commonly selected for applications involving many mineral oils, greases and compatible lubricants.

Exact compatibility depends on the specific NBR compound, operating medium, additives, temperature and actual service conditions.

The exact temperature range, hardness and chemical resistance of this GRN product should therefore not be derived from specifications published for NBR compounds used by other manufacturers.

GRN 28x35x4 NBR Oil Seal

Brand: GRN

Dimensions: 28x35x4 mm

Material: NBR

Design: AO/TC

Configuration: Double Lip

Shaft diameter: 28 mm

Housing bore: 35 mm

Width: 4 mm

The dimensional designation defines the basic installation geometry, while AO/TC identifies the double lip sealing configuration.

Both dimensions and construction should be verified when identifying a replacement.

28x35x4 AO/TC vs Single Lip Oil Seal

AO/TC version: Spring-loaded primary lip + additional dust lip

Single lip version: Primary sealing lip without additional dust lip

Two rotary shaft seals may have identical 28x35x4 mm dimensions but different lip configurations.

If the original installation requires a double lip seal, a single lip version should not automatically be considered technically interchangeable solely because its dimensions are identical.

AO and TC Oil Seal Designations

GRN designation: AO/TC

Seal type: Double lip rotary shaft oil seal

Different manufacturers use different designation systems for radial shaft seal profiles.

In this product description, AO/TC identifies a configuration with a spring-loaded primary sealing lip and an additional dust lip.

Profile codes are not completely universal between manufacturers. Dimensions, material and complete seal construction should therefore be checked rather than relying only on a profile designation.

Compact 28x35x4 mm Oil Seal

The 28x35x4 mm dimensions create a relatively compact radial section and a width of only 4 mm.

Inside diameter: 28 mm

Outside diameter: 35 mm

Radial dimensional difference: 7 mm

Width: 4 mm

Because of the limited installation dimensions, the 4 mm width is particularly important when comparing this seal with wider 28x35 mm variants.

A seal with a greater width should not automatically be considered a dimensional replacement.

How to Select a 28x35x4 Oil Seal

When selecting a replacement, verify:

Shaft diameter: 28 mm

Outside diameter: 35 mm

Width: 4 mm

Material: NBR

Design: AO/TC

Configuration: Double Lip

Primary sealing lip: Spring-loaded

Additional dust lip: Yes

The operating medium and actual service conditions should also be considered.

Matching dimensions alone do not establish complete interchangeability between seals manufactured from different materials or with different lip configurations.

GRN 28x35x4 NBR AO/TC - Stock in Poland

GRN 28x35x4 NBR AO/TC Double Lip Rotary Shaft Oil Seal is available from stock in Poland.

Warehouse and Store: Lublin, Smoluchowskiego 1 Street, Building 4

Shipping: 24h

Stock location: Poland

Delivery: Poland and EU countries

FAQ - GRN 28x35x4 NBR AO/TC

What are the dimensions of the GRN 28x35x4 oil seal?

The complete dimensions are 28x35x4 mm: 28 mm inside diameter, 35 mm outside diameter and 4 mm width.

Is the GRN 28x35x4 AO/TC a double lip oil seal?

Yes. The AO/TC configuration is a double lip design with a primary sealing lip and an additional dust lip.

What material is the GRN 28x35x4 seal made from?

The sealing material is NBR - Nitrile Butadiene Rubber.

Does the 28x35x4 AO/TC oil seal have a spring?

Yes. The primary sealing lip is supported by a garter spring.

Does the GRN 28x35x4 seal have a dust lip?

Yes. The AO/TC design incorporates an additional dust lip.

What shaft diameter is the 28x35x4 oil seal designed for?

The nominal inside diameter is 28 mm, corresponding to the nominal shaft diameter.

Frequently Asked Questions by Engineers

What does 28x35x4 mean on an oil seal?

It specifies a 28 mm inside diameter, 35 mm outside diameter and 4 mm width.

What does AO/TC mean?

For this product, AO/TC identifies a double lip rotary shaft seal with a spring-loaded primary sealing lip and an additional dust lip.

What is the difference between AO/TC and SC?

AO/TC identifies the double lip configuration with an additional dust lip, while SC is commonly used for a single lip configuration without the additional dust lip.

Can a 28x35x4 single lip oil seal replace the AO/TC version?

Interchangeability should not be assumed from dimensions alone. The AO/TC version incorporates an additional dust lip that changes the sealing configuration.

Can a 28x35x5 oil seal replace 28x35x4?

The dimensions are not identical. A 28x35x5 seal has a width of 5 mm, while this product has a specified width of 4 mm.

What is the operating temperature of GRN 28x35x4 NBR?

The exact operating temperature requires confirmation for the specific NBR compound used in this GRN product. Temperature limits specified by another seal manufacturer should not automatically be transferred to GRN.

AI Overview

GRN 28x35x4 NBR AO/TC is a double lip rotary shaft oil seal with a 28 mm inside diameter, 35 mm outside diameter and 4 mm width. The sealing material is NBR - Nitrile Butadiene Rubber. The AO/TC configuration incorporates a spring-loaded primary sealing lip and an additional dust lip. When selecting a replacement, the complete 28x35x4 mm dimensions, NBR material and double lip configuration should be verified.